Find Costumes, Accessories and Props at Target.com! Score major points this Halloween when you wear this Adult Super Mario Bros: Red Mushroom Adult Hat - One Size Fits Most. Made of a soft, velvety fabric, this hat is a comfy accessory that tops off your costume. Create a simple, instant Super Mario Bros Halloween costume by pairing this red and white spotted hat with a solid red tee and pants. This mushroom hat will make you want to turn any costume party into a Mario Party. Spot clean. Gender: Unisex.